As i've always told everyone, MeeGo is a versatile Operating System that is very skinnable. Check out this Video off a Compiz Fusion running on the WeTab.
In a nutshell, Compiz is a compositing manager, which means that it enhances the overall user interaction by adding fancy effects to your windows, from drop shadows to awesome desktop effects like the Desktop Cube or the Expo view.
Compiz can also be a window manager, which means that it is the software between you and your desktop apps. It enables you to move or resize windows, to switch workspaces, to switch windows easily (using alt-tab or so), and so on.
Source Tablet PC Tests